# SAE 4140 ultra low Sulfur, Q+T, HRc=40.5 # MacSteel Ht. M18322, ElecFurn ConCast Forged 2150F # to 2.5"sq bars, 83% reduction # Normalized, 1550F, Quenched+Tempered # Specimens machined transverse to bar length. # Chem.: 0.41wt%C .87Mn .01P .0040S .2400Si .100Cu .050Ni # .900Cr .180Mo .020Al .0050Sn 58ppm_N # Inclusion Rating TypeA(sulfide) 0.5T 0H, TypeB(alumina) 0T 0H # TypeC(silicate) 0T 0H, TypeD(globular) 1T 0.5H # Martensite, %= 100 # Tested by N.Cyril U.Toledo 2007 #FileType= strain_life #DataType= raw #Name= SAE4140 #Name= AISIiter99 #Units= MPa #Sy= 1261.0 #Su= 1333. #eu= 0.04 engr. strain at Su #E= 209400 average of 11 initial. Reported=208100 #monotonic_K= 1558. #monotonic_n= 0.035 #LowerYield= 1252. #UpperYield= 1258. #MaterialForm= bar #FailureDef= 50% load drop #%RA= 44 % #%Elongation= 30.8 % over 0.3 inch #FractureStress= 1518 #FractureStrain= 0.581 #BHN= 375 #Hardness, Rockwell C= 40.5 #strAmp 2Nv StsAmpl So PlsStrAmp Emod 0.019970 190 1098 -20.1 0.014690 208200 #IGL 0.019900 378 1089 -12.8 0.014630 209200 #IGL 0.019800 390 1112 -13.2 0.014500 210600 #IGL 0.009980 1642 942 -12.1 0.005450 207900 #IGL 0.010000 1852 931 -12.0 0.005520 210600 #IGL 0.009910 2032 930 -8.3 0.005440 208900 #IGL 0.004990 17148 818 -53.7 0.001060 207900 #IGL 0.005020 18062 832 -11.5 0.001020 209400 #IGL 0.005030 22754 833 -36.7 0.001030 210300 #IGL 0.003750 65280 776 0.0 0.000000 209400 #IGL 0.003750 81202 800 11.7 0.000000 212700 #IGL 0.003750 103218 788 58.1 0.000000 207700 #IGL 0.003250 147330 672 0.0 0.000000 209400 #IGL 0.003250 210654 672 0.0 0.000000 209400 #IGL 0.003000 247200 621 0.0 0.000000 209400 #IGL 0.002750 2011184 569 0.0 0.000000 209400 #IGL 0.002750 3712452 569 0.0 0.000000 209400 #IGL 0.002750 10000000 569 0.0 0.000000 209400 #Runout #Carbon, %= 0.4100 #Manganese, %= 0.8700 #Phosphorus, %= 0.0100 #Sulfur, %= 0.0040 #Silicon, %= 0.2400 #Copper, %= 0.1000 #Nickel, %= 0.0500 #Chromium, %= 0.9000 #Molybdenum, %= 0.1800 #Aluminum, %= 0.0200 #Tin, %= 0.0050 #Nitrogen, ppm= 58.0000 # #